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使用尾波干涉测量法在四点弯曲试验中检测多条裂纹

Detection of Multiple Cracks in Four-Point Bending Tests Using the Coda Wave Interferometry Method.

作者信息

Wang Xin, Chakraborty Joyraj, Bassil Antoine, Niederleithinger Ernst

机构信息

Bundesanstalt für Materialforschung und-prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.

Research and development department, NeoStrain Sp. z o.o, Lipowa 3, 30-702 Krakow, Poland.

出版信息

Sensors (Basel). 2020 Apr 2;20(7):1986. doi: 10.3390/s20071986.

DOI:10.3390/s20071986
PMID:32252283
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7180998/
Abstract

The enlargement of the cracks outside the permitted dimension is one of the main causes for the reduction of service life of Reinforced Concrete (RC) structures. Cracks can develop due to many causes such as dynamic or static load. When tensile stress exceeds the tensile strength of RC, cracks appear. Traditional techniques have limitations in early stage damage detection and localisation, especially on large-scale structures. The ultrasonic Coda Wave Interferometry (CWI) method using diffuse waves is one of the most promising methods to detect subtle changes in heterogeneous materials, such as concrete. In this paper, the assessment of the CWI method applied for multiple cracks opening detection on two specimens based on four-point bending test is presented. Both beams were monitored using a limited number of embedded Ultrasonic (US) transducers as well as other transducers and techniques (e.g., Digital Image Correlation (DIC), LVDT sensors, strain gauges, and Fiber Optics Sensor (FOS)). Results show that strain change and crack formation are successfully and efficiently detected by CWI method even earlier than by the other techniques. The CWI technique using embedded US transducers is undoubtedly a feasible, efficient, and promising method for long-term monitoring on real infrastructure.

摘要

裂缝尺寸超出允许范围的扩大是导致钢筋混凝土（RC）结构使用寿命缩短的主要原因之一。裂缝可能由于多种原因产生，如动载或静载。当拉应力超过RC的抗拉强度时，裂缝就会出现。传统技术在早期损伤检测和定位方面存在局限性，尤其是对于大型结构。利用散射波的超声尾波干涉测量法（CWI）是检测诸如混凝土等非均质材料细微变化最有前景的方法之一。本文介绍了基于四点弯曲试验，对应用于两个试件多裂缝开口检测的CWI方法的评估。两根梁均使用了数量有限的嵌入式超声（US）换能器以及其他换能器和技术（如数字图像相关法（DIC）、线性可变差动变压器（LVDT）传感器、应变片和光纤传感器（FOS））进行监测。结果表明，CWI方法甚至比其他技术更早地成功且有效地检测到了应变变化和裂缝形成。使用嵌入式US换能器的CWI技术无疑是一种用于实际基础设施长期监测的可行、高效且有前景的方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/43758807f7d7/sensors-20-01986-g020.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/2520980d6a81/sensors-20-01986-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/f0bdbe8c16fa/sensors-20-01986-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/c5508526aa25/sensors-20-01986-g014.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/f18c67940c4e/sensors-20-01986-g015.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/b0b88d493ef4/sensors-20-01986-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/b70687d991f6/sensors-20-01986-g017.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/eb77f71bfabb/sensors-20-01986-g018.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/85c6d7539e88/sensors-20-01986-g019.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9126/7180998/43758807f7d7/sensors-20-01986-g020.jpg

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